diff --git a/client.go b/client.go
index 1061393..435769e 100644
--- a/client.go
+++ b/client.go
@@ -35,5 +35,5 @@ func (c *Client) enqueue(msg *rdb.TaskMessage, processAt time.Time) error {
 	if time.Now().After(processAt) {
 		return c.rdb.Enqueue(msg)
 	}
-	return c.rdb.Schedule(rdb.Scheduled, processAt, msg)
+	return c.rdb.Schedule(msg, processAt)
 }
diff --git a/internal/rdb/rdb.go b/internal/rdb/rdb.go
index 48be550..b8c0d5b 100644
--- a/internal/rdb/rdb.go
+++ b/internal/rdb/rdb.go
@@ -173,8 +173,18 @@ func (r *RDB) Done(msg *TaskMessage) error {
 	return nil
 }
 
-// Schedule adds the task to the zset to be processd at the specified time.
-func (r *RDB) Schedule(zset string, processAt time.Time, msg *TaskMessage) error {
+// Schedule adds the task to the backlog queue to be processed in the future.
+func (r *RDB) Schedule(msg *TaskMessage, processAt time.Time) error {
+	return r.schedule(Scheduled, processAt, msg)
+}
+
+// RetryLater adds the task to the backlog queue to be retried in the future.
+func (r *RDB) RetryLater(msg *TaskMessage, processAt time.Time) error {
+	return r.schedule(Retry, processAt, msg)
+}
+
+// schedule adds the task to the zset to be processd at the specified time.
+func (r *RDB) schedule(zset string, processAt time.Time, msg *TaskMessage) error {
 	bytes, err := json.Marshal(msg)
 	if err != nil {
 		return fmt.Errorf("could not marshal %+v to json: %v", msg, err)
diff --git a/internal/rdb/rdb_test.go b/internal/rdb/rdb_test.go
index 549e4de..cefa518 100644
--- a/internal/rdb/rdb_test.go
+++ b/internal/rdb/rdb_test.go
@@ -144,8 +144,8 @@ func TestDequeue(t *testing.T) {
 		}
 		got, err := r.Dequeue(time.Second)
 		if !cmp.Equal(got, tc.want) || err != tc.err {
-			t.Errorf("(*rdb).dequeue(%q, time.Second) = %v, %v; want %v, %v",
-				DefaultQueue, got, err, tc.want, tc.err)
+			t.Errorf("(*RDB).Dequeue(time.Second) = %v, %v; want %v, %v",
+				got, err, tc.want, tc.err)
 			continue
 		}
 		if l := r.client.LLen(InProgress).Val(); l != tc.inProgress {
@@ -306,7 +306,7 @@ func TestMoveAll(t *testing.T) {
 		}
 
 		if err := r.MoveAll(InProgress, DefaultQueue); err != nil {
-			t.Errorf("(*rdb).moveAll(%q, %q) = %v, want nil", InProgress, DefaultQueue, err)
+			t.Errorf("(*RDB).MoveAll(%q, %q) = %v, want nil", InProgress, DefaultQueue, err)
 			continue
 		}
 
@@ -370,7 +370,7 @@ func TestForward(t *testing.T) {
 
 		err := r.Forward(Scheduled)
 		if err != nil {
-			t.Errorf("(*rdb).forward(%q) = %v, want nil", Scheduled, err)
+			t.Errorf("(*RDB).Forward(%q) = %v, want nil", Scheduled, err)
 			continue
 		}
 		queued := r.client.LRange(DefaultQueue, 0, -1).Val()
@@ -391,12 +391,10 @@ func TestSchedule(t *testing.T) {
 	tests := []struct {
 		msg       *TaskMessage
 		processAt time.Time
-		zset      string
 	}{
 		{
 			randomTask("send_email", "default", map[string]interface{}{"subject": "hello"}),
 			time.Now().Add(15 * time.Minute),
-			Scheduled,
 		},
 	}
 
@@ -406,21 +404,64 @@ func TestSchedule(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		err := r.Schedule(tc.zset, tc.processAt, tc.msg)
+		err := r.Schedule(tc.msg, tc.processAt)
 		if err != nil {
 			t.Error(err)
 			continue
 		}
 
-		res, err := r.client.ZRangeWithScores(tc.zset, 0, -1).Result()
+		res, err := r.client.ZRangeWithScores(Scheduled, 0, -1).Result()
 		if err != nil {
 			t.Error(err)
 			continue
 		}
 
-		desc := fmt.Sprintf("(*rdb).schedule(%q, %v, %v)", tc.zset, tc.processAt, tc.msg)
+		desc := fmt.Sprintf("(*RDB).Schedule(%v, %v)", tc.msg, tc.processAt)
 		if len(res) != 1 {
-			t.Errorf("%s inserted %d items to %q, want 1 items inserted", desc, len(res), tc.zset)
+			t.Errorf("%s inserted %d items to %q, want 1 items inserted", desc, len(res), Scheduled)
+			continue
+		}
+
+		if res[0].Score != float64(tc.processAt.Unix()) {
+			t.Errorf("%s inserted an item with score %f, want %f", desc, res[0].Score, float64(tc.processAt.Unix()))
+			continue
+		}
+	}
+}
+
+func TestRetryLater(t *testing.T) {
+	r := setup(t)
+	tests := []struct {
+		msg       *TaskMessage
+		processAt time.Time
+	}{
+		{
+			randomTask("send_email", "default", map[string]interface{}{"subject": "hello"}),
+			time.Now().Add(15 * time.Minute),
+		},
+	}
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := r.client.FlushDB().Err(); err != nil {
+			t.Fatal(err)
+		}
+
+		err := r.RetryLater(tc.msg, tc.processAt)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		res, err := r.client.ZRangeWithScores(Retry, 0, -1).Result()
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		desc := fmt.Sprintf("(*RDB).RetryLater(%v, %v)", tc.msg, tc.processAt)
+		if len(res) != 1 {
+			t.Errorf("%s inserted %d items to %q, want 1 items inserted", desc, len(res), Retry)
 			continue
 		}
 
diff --git a/poller_test.go b/poller_test.go
index 81ab104..4821a7d 100644
--- a/poller_test.go
+++ b/poller_test.go
@@ -67,14 +67,14 @@ func TestPoller(t *testing.T) {
 		}
 		// initialize scheduled queue
 		for _, st := range tc.initScheduled {
-			err := rdbClient.Schedule(rdb.Scheduled, st.processAt, st.msg)
+			err := rdbClient.Schedule(st.msg, st.processAt)
 			if err != nil {
 				t.Fatal(err)
 			}
 		}
 		// initialize retry queue
 		for _, st := range tc.initRetry {
-			err := rdbClient.Schedule(rdb.Retry, st.processAt, st.msg)
+			err := rdbClient.RetryLater(st.msg, st.processAt)
 			if err != nil {
 				t.Fatal(err)
 			}
diff --git a/retry.go b/retry.go
index f7a815a..838d07a 100644
--- a/retry.go
+++ b/retry.go
@@ -21,7 +21,7 @@ func retryTask(r *rdb.RDB, msg *rdb.TaskMessage, err error) {
 	retryAt := time.Now().Add(delaySeconds((msg.Retried)))
 	log.Printf("[INFO] Retrying task(Type: %q, ID: %v) in %v\n", msg.Type, msg.ID, retryAt.Sub(time.Now()))
 	msg.Retried++
-	if err := r.Schedule(rdb.Retry, retryAt, msg); err != nil {
+	if err := r.RetryLater(msg, retryAt); err != nil {
 		log.Printf("[ERROR] Could not add msg %+v to 'retry': %v\n", msg, err)
 		return
 	}